Thanks Jochem, I now solved the problem with your help, the following way:
In the parent-class I define:
static function getTableName($classname) {
if (defined("$classname::TABLE_NAME")) {
return(constant("$classname::TABLE_NAME"));
} else {
throw new Exception("No TABLE_NAME for ".$classname." defined!");
}
}And in each child-class I define, the const TABLE_NAME.
Now I have two more problems: - I have to pass the Classname as a parameter to all my static functions: for Example: echo testTable::toHtml_table_heading($dbConnect, "testTable");
- I need a similar thing for an Array $fields, which contains the field descriptions of the class:
static function toHtml_table_heading($dbConnect, $classname) {
$result = "\n\t<tr>";
if (!isset("$classname::$fields")) {
$classname->intializeClass($dbConnect, $classname);
}
...
Thankyou, André
Jochem Maas wrote:
André Pletschette wrote:
Hi,
I've got one function getTableName() which returns the Database-Table with the data of a class (see below).
As you can see it always calls the static $tablename of the subclass described by $this->classname.
I solved this problem by doing the following:
abstract class DBTable { // we can't define abstract consts. // but this must be defined in your subclass // const TABLE_NAME = 'xxxxx';
// define this func in your subclasses abstract function getTableName(); }
class C1 extends DBTable { function getTableName() { return self::TABLE_NAME; } }
it seems like a crap way of doing it but its very flexible and easy to understand (it just doesn't have that certain 'je ne c'est quoi') - none the less it was born out of a need for major flexibility (for pretty much similar reasons to you - namely generic data objects), anyway it gives you many ways to skin the cat (get the tablename):
<?
$c = new C1;
echo $c->getTableName(); echo C1::getTableName(); echo C1::TABLE_NAME;
$a = 'C1';
if (defined("$a::TABLE_NAME")) { echo constant("$a::TABLE_NAME"); }
if someone has a better way, bring it on :-) I'd love to be able to improve my own code.
You may also want to look at the possibility of using class names that are always indentical to the table names - I tried that but I didn't like it.
Thankyou, André
Here the function:
function getTableName() { if ($this->classname == "class1") { return class1::$tablename; } elseif ($this->classname == "class2") { return class2::$tablename; } elseif ($this->classname == "class3") { return class3::$tablename; }... ... }else { throw new Exception($this->classname." not found!"); } }
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